sig mcx 556

Sig Mcx 556 - In Editorial, Exports, NFA / Prohibitor / Class III, Product Announcements, Firearms, Semi-Auto by Pete No Comments

The design of the small arms is presented in a revolutionary and evolutionary process, each equally important to the development of a powerful weapon system. For manufacturers, engineering a new gun and developing it is an iterative process that requires refinement, continuous improvement, and productivity. For users, the pleasure of the new system is combined with appropriate concerns, hopes and expectations of additional features in the next release - a cycle not unique to the gun industry. In early 2015, SIG Sauer released the MCX, a revolutionary design in the market for direct AR-15 variants. In the years since its first release, the MCX evolved into the MCX Virtus, which led to where we are today - introducing the SIG MCX SPEAR-LT.

Sig Mcx 556

MCX SPEAR-LT may not look impressive at first glance, but it is the most advanced to date, adding features, reducing weight, while being compatible with all MCX Virtus models from the past five years.

Sig Sauer Mcx Virtus Patrol .300 Blackout

Compare and Contrast: New MCX SPEAR-LT 16" 5.56 Carbine (Top) and MCX Virtus 9" 300BLK (Bottom).

By itself, the short stroke piston is not a 'revolutionary system' - many rifles and carbines have used this system with great success. But SIG improved a series of features around the short stroke piston to develop a progressive rifle that eliminated many of the flaws shown in the AR-15 and other weapon systems.

If you own MCX Virtus, don't worry. All parts are backwards compatible. But for obvious reasons you cannot take advantage of all the new features of MCX SPEAR-LT if you decide to integrate and adapt.

The handguard on the SPEAR-LT is thin, light and attached to the upper receiver with two screws. Some users are concerned about possible changes in the point of effect (POI) when using laser devices attached to the hand guard on the Virtus system. Although I tried it several times and after removing it completely the IR laser continued to zero. The lower profile of the SPEAR-LT hand guard allows for a more secure hand grip.

Sig Mcx Spear Lt Pistol 5.56/.223, 11\

Using a button design instead of a lift up and flip function, the new MCX folding stock folds easily as needed. There is a removable cheek rest for shooters who don't want to feel the cold metal against their skin.

One of the major additions to the MCX SPEAR-LT is the right hand release, making this gun completely ambidextrous. This compact design was first introduced with the SIG Switchblade M400 AR-15 series and is low profile and easy to use. It's beautiful, but it's not - it's strong and it works.

Look at the new stock design of the push button collapse - just press down and turn counter clockwise.

Below is the left side bolt that secures the hand guard to the upper receiver. To remove the hand guard, remove the two screws, remove the pivot pin and pull forward.

Sig Mcx Rattler Pistol

Compared to the MCX Virtus lower receiver (below), the MCX SPEAR-LT lower receiver (top) has some internal geometry changes in addition to the ambidextrous release on the right side. If you are scoffing at my dirty MCX Virtus Lower, be advised that the MCX is my favorite carbine and is shot a lot.

The only real difference between the SPEAR-LT (top) and Virtus (bottom) small receivers is that the right side release button appears to have a profile. Also note that the entire gun is anodized in Coyote FDE while the MCX Virtus can have an anodized factory and Cerakote coated parts.

The springs and bearing groups have the same external geometry, keeping everything in place.

But one of the new features of the SPEAR-LT is the ability to use any MILSPEC AR-15 trigger. This change requires a redesign of the MCX's locking firing pin system. The SPEAR-LT BCG (top) appears to have a field of fire lock on the left side of the barrel directly behind the firing pin (pictured here with the bottom of the firing pin). Where Virtus lands from the pinfall lock.

Sig Rattler Pistol Review: Specs And Features

Below: The firing pin lock design (highlighted in yellow) on the MCX Virtus from MCX Small Parts Shopper (SIG). We will be doing a full ballpark in the coming weeks - I want to get as many rounds through this gun as it came from the factory before I do any damage.

After a thorough review of the SPEAR-LT (top) and Virtus (bottom) receiver groups, I couldn't find any significant differences.

As the first release of the SPEAR-LT I was disappointed with the 16 inch barrel (yes, I use words like 'bimoan' and even complained about the new model MCX SPEAR-LT being 'too long'). But the barrel length makes perfect sense. With a brace that keeps the rifle in compliance with ATF regulations and the NFA application process taking months to complete or transferring a Short Barrel Rifle (SBR), the 16″ rifle is the best way to get your hands on a SPEAR-LT . as soon as possible.

Additionally, when the barrel and handguards are in place, new owners can start the ATF Form 1 process and build their own SBR while running a 16" rifle. The MCX barrel swap can be completed with tools It's simple, doesn't require armor like an AR-15 barrel change, and can be completed in less than two minutes. As a reminder, always read the owner's manual before operating or disassembling a new rifle to make sure you follow the proper procedures.

Sig Sauer Mcx Rattler 5.56mm Pistol W/brace, M Lok Handguard, 5.5\

Below: 9″ MCX Virtus in 300BLK chambered with SIG SLX762-QD (top) and 16″ SPEAR-LT in 5.56 (bottom).

As a huge fan of the SIG MCX Virtus, I am very happy to finally witness the evolution of the MCX SPEAR-LT. This rifle sheds some weight, adds new features, is backward compatible, and builds on a proven system used by military, law enforcement and civilians around the world. Best of all, the MCX SPEAR-LT is in production and available for purchase starting tomorrow.

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